GitHub user stanzhai opened a pull request:
https://github.com/apache/spark/pull/16874
[SPARK-19509][SQL][branch-2.1]Fix a NPE problem in grouping sets when using
an empty column
## What changes were proposed in this pull request?
If a column of a table is all null values, the follow SQL will throw an
NPE: `select count(1) from test group by e grouping sets(e)`.
The reason is that when transformUp a `GroupingSets` in
`ResolveGroupingAnalytics` it uses a `nullBitmask` to set an attribute with
null ability, the nullable attribute may be modified.
This pr just set all attribute's null ability to `true` in group by
expressions to fix the problem.
The pr #15484 in master branch has fixed this problem.
## How was this patch tested?
Test with Hive in my environment.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/stanzhai/spark fix-grouping-sets
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16874.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #16874
----
commit 3690cb29a3c15903dd6290502fb736daa99157b4
Author: Stan Zhai <zhaishi...@haizhi.com>
Date: 2017-02-09T13:22:02Z
fix a NPE issue of grouping sets
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